I have no knowledge of the software but this part is troubling me:
13:56:47 T:2940562240 INFO: CAESinkALSA::InitializeHW - Your hardware does not support AE_FMT_FLOAT, trying other formats
13:56:47 T:2940562240 INFO: CAESinkALSA::InitializeHW - Using data format AE_FMT_S24NE4
...
13:56:47 T:2940562240 DEBUG: CSoftAEStream::CSoftAEStream - Converting from AE_FMT_S16NE to AE_FMT_FLOAT
Shouldn't CSoftAEStream convert from AE_FMT_S24NE4 instead of AE_FMT_S16NE ?